- a river in S central Europe, rising in the Ukraine and flowing from the Carpathian Mountains along the Romanian border into E Hungary, Slovakia, and Serbia, where it joins the Danube N of Belgrade. 800 miles (1,290 km) long.
- a river in S central Europe, rising in W Ukraine and flowing west, forming part of the border between Ukraine and Romania, then southwest across Hungary into Serbia to join the Danube north of Belgrade
